import router from './router'
import store from './store'
import { Message } from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css' // progress bar style
import { getToken } from '@/utils/auth' // get token from cookie
import getPageTitle from '@/utils/get-page-title'

NProgress.configure( { showSpinner: false } ) // NProgress Configuration

const whiteList = [ '/login', '/register', '/forget', '/redirect', '/auth-redirect' ] // no redirect whitelist

router.beforeEach( async( to, from, next ) => {
    // start progress bar
    NProgress.start()

    // set page title
    document.title = getPageTitle( to.meta.title )

    // determine whether the user has logged in
    const hasToken = getToken()

    if ( hasToken ) {
        if ( to.path === '/login' ) {
            // if is logged in, redirect to the home page
            next( { path: '/' } )
            NProgress.done()
        } else {
            // determine whether the user has obtained his permission roles through getInfo
            const hasRoles = store.getters.roles && store.getters.roles.length > 0
            
            if ( hasRoles ) {
                next()
            } else {
                try {
                    // get user info
                    // note: roles must be a object array! such as: ['admin'] or ,['developer','editor']
                    const { roles } = await store.dispatch( 'user/userinfo' )
                    
                    // generate accessible routes map based on roles
                    const accessRoutes = await store.dispatch( 'permission/generateRoutes', roles )
                    
                    // dynamically add accessible routes
                    router.addRoutes( accessRoutes )

                    // hack method to ensure that addRoutes is complete
                    // set the replace: true, so the navigation will not leave a history record
                    next( { ...to, replace: true } )
                } catch ( error ) {
                    // remove token and go to login page to re-login
                    await store.dispatch( 'user/resetToken' )
                    Message.error( error || '未知错误,请稍后再试' )
                    next( `/login?redirect=${to.path}` )
                    NProgress.done()
                }
            }
        }
    } else {
    /* has no token */

        if ( whiteList.indexOf( to.path ) !== -1 ) {
            // in the free login whitelist, go directly
            next()
        } else {
            // other pages that do not have permission to access are redirected to the login page.
            next( `/login?redirect=${to.path}` )
            NProgress.done()
        }
    }
} )

router.afterEach( () => {
    // finish progress bar
    NProgress.done()
} )
